(@NWSCaribou) PHILADELPHIA - We're barely over a week past the summer solstice and it's all downhill from here.For three days each summer from June 26-28, the official sunset time in Philadelphia peaks at 8:34 p.m., according to the daily climate reports from the National Weather Service office in Mount Holly.But tonight, the sun will dip below the horizon one minute earlier at 8:33 p.m., the daily climate report shows.Daily climate report from the NWS office in Mount Holly. (NWS/Mount Holly)This kind of makes sense since the summer solstice, the longest day of the year, was back on June 20, so the days should be slowly getting shorter by now.